ML20113H120
| ML20113H120 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 06/30/1992 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20113H122 | List: |
| References | |
| NUDOCS 9207070406 | |
| Download: ML20113H120 (1) | |
Text
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s TABLE 4.7-3 SNUBBER VISUAL INSPECTION INTERVAL o2 NUMBER OF UNACCEPTABLE SNUBBERS P
' G; Population Column A Column B Colurn C a
or Category Extend Interval Repeat Interval Reduce Interval 2
(Notes 1 and 21 (Notes 3 and 6)
(Notes 4 and 6)
(Notes 5 and 61 c
1 0
0 1
80 0
0 2
100 0
1 4
m 150 0
3 8
~
200 2
5 13 300 5
12 25 Note 1: The next visual inspection interval for a snubber population or category size shall be determined based upon the previous inspection interval' and the number of unacceptable snubbers found during that interval.
Snubbers may be categorized, based upon their accessibility during power operation, as accessible or inaccessible.
These categories may be examined separately or jointly.
However, that w1 decision must be made and documented before any inspection and that decision shall be used as the basis upon which to determine the next inspection interval for that category.
y O
" Note 2:
Interpolation between population or category sizes and the number of unacceptable snubbers is permissible. Use next lower integer for the value of the limit for Columns A, B, or C if that integer includes a fractionc' value of unacceptable snubbers as determined by interpolation.
Note 3:
If the numba. of unacceptable snubbers is equal to or less than the number in Column A, the next inspection interval may be twice the previous interval but not greater than 48 months.
E
@ Note 4:
If the number of unacceptable snubbers is equal to or less than ?.he number in Column B but greater than the number in Column A, the next inspection interval shall be the same as the previous interval.
E
" Note 5:
If the nuinber of unacceptable snubbers is equal tn or greater than the number in Column C, the next
- y inspection interval shall be two-thirds of the previous interval.
However, if the number of unacceptable snubbers is less than the number in Column C but greater than the number in Column B, D
the next interval shall be reduced proportionally by interpolation, that is, the previous interval l
shall be reduced by a factor that is one-third of the ratio of the difference between the number l
M of unacceptable snubbers found during the previous interval and the numoer in Column B to the l
L difference in the numbers in Columns B and C.
l 8
Note 6:
The provisions of Specification 4.0.2 are applicable for all inspection intervals up to and including 48 months.
9207070406 920630 PDR ADOCK 05000336 P